No I didn’t look in the database. But, in the admin panel at WordPress I didn’t see a user who didn’t confirm yet. Also, I didn’t see an email to me saying that there is a new registration. The registration was working before.

I just tried registering on your site and also didn’t get the confirmation email.

Some hosting providers have very strict limitations, and sometimes disable, email being sent by applications. It’s not uncommon for a provider to block port 25, 465, 587, etc, to prevent external SMTP servers from sending mail. I’d ask your hosting provider about this.

Please note that a major requirement is that you will have to set either the “TO”(recipient e-mail address) or the “FROM”(sender e-mail address) header of your e-mail form to be an operational e-mail address created with your account with us.
PHP mail() function is properly operational on our servers.
I can see that the main email address in General settings of the script is set with the domain: info@yourbizcafe.net. Although this is so, if you are using some additional plugins for registrations you should revise the plugin options and make sure that From address is set with your domain as well.

There are also some rare cases when WordPress script requires an address: wordpress@host to be created, where “host” should be replaced with the actual domain or subdomain name which the WordPress script is installed for. In your case you can try also to create wordpress@yourbizcafe.net and forward it to your main address: info@yourbizcafe.net, thus you would monitor only your address.
If there is anything else we can help with, feel free to write.